The clean power goal is “eminently attainable, but it’s not a slam dunk,” blogged Clare Demerse, policy expert at Clean Energy Canada.

Today, 37% comes from nuclear, renewables or fossil fuels with carbon capture and storage. To achieve the 2025 goal, nearly all new generation capacity must be clean, she said, accelerating an existing trend.

Canada is ahead of its neighbours, with 65% renewable and 16% nuclear on the grid, making it well placed to export. The countries agreed to collaborate on cross-border electricity transmission projects.

Meanwhile, methane rules tackle a greenhouse gas 25 times as potent as carbon dioxide over a 100 year timeframe.

The target adopted by all three countries will have an impact equivalent to taking 85 million cars off the road, analysts at the Environmental Defense Fund, Centro Mario Molina and Pembina Institute calculate.

Sam Adams, US director of the World Resources Institute, said the deal set a “powerful example” to others.

“Sharing a common vision for the future, these leaders recognize the importance of providing economic stability and greater climate security for the long term,” he said.